Programming-How to use PHP to do a picture layering (zooming in and out) the effect of browsing?

Programming Html5phphtmljavascrpit

I need to do a link to the following site image browsing effect.
http://brain-maps.org/ajax-viewer.php?datid=42&sname=385
1. First, the mouse wheel scrolling can zoom in and out, the mouse press the left button to move, you can grasp the same point as the hand to display the reverse pull over the content.
2. Then these figures are very large, some several g, so the picture into a number of layers, each layer and a lot of pictures of the slice composition, need to display the time before loading.
What kind of programming ideas should be made to achieve these effects? What technologies do you need to use?
I just learned PHP 2 months, will be simple JS, HTML, what needs to learn?

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